When I enabled my Nvidia graphics card, it changed the resolution of my screen to larger than my screen. As the result I cannot access any functions that were previously on the right side of my screen. How do I undo this? I originally had 8.04 and was able to change the resolution to whatever I wanted.

I'm a new user and can copy and paste commands from a post to terminal mode but that's about it. I have no idea what they are or what they mean.